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From: Robert Haas <robertmhaas@gmail.com>
Date: Thu, 12 Feb 2026 14:00:22 -0500
Message-ID: <CA+TgmobRs1a3ctr=_3DozWR4Ftxb0jqrRfZR-hNiGghCcq2AXg@mail.gmail.com>
Subject: Re: pg_plan_advice
To: Ajay Pal <ajay.pal.k@gmail.com>
Cc: Alexandra Wang <alexandra.wang.oss@gmail.com>, Richard Guo <guofenglinux@gmail.com>, 
	Lukas Fittl <lukas@fittl.com>, Tom Lane <tgl@sss.pgh.pa.us>, 
	Jacob Champion <jacob.champion@enterprisedb.com>, Dian Fay <di@nmfay.com>, 
	Matheus Alcantara <matheusssilv97@gmail.com>, Jakub Wartak <jakub.wartak@enterprisedb.com>, 
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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On Thu, Feb 12, 2026 at 8:08=E2=80=AFAM Robert Haas <robertmhaas@gmail.com>=
 wrote:
> On Thu, Feb 12, 2026 at 6:41=E2=80=AFAM Ajay Pal <ajay.pal.k@gmail.com> w=
rote:
> > pg_plan_advice failed to match JOIN_ORDER advice because the genetic
> > algorithm never attempts the specific join path requested.
>
> Seems expected. It is bad if using GEQO results in a crash or if the
> advice cause the expected outcome when the path is considered, but if

sorry, this should have said "doesn't cause"

> the randomness of GEQO causes it not to consider the path the user
> wants, then the user either needs to stop using GEQO, or use
> less-strict plan advice, or just understand that this kind of outcome
> is a possibility.

--=20
Robert Haas
EDB: http://www.enterprisedb.com